Trephine drill



FIG. 1 is a perspective view of a trephine drill, showing the newdesign;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

What is claimed is the ornamental design for a trephine drill, as shownand described.